<template>
  <el-container class='home-container'>
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/heima.png">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="infor" @click='logout'>退出</el-button>
    </el-header>
    <!-- 主体 -->
    <el-container>
      <!-- 侧边 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠 -->
        <div class="toggle-button" @click="toggleCollapse" v-text="isCollapse?'|||':'| | |'"></div>
        <!-- 侧边菜单 -->
        <el-menu background-color="#333744" unique-opened
        text-color="#fff" active-text-color="#409EFF"
         :collapse="isCollapse"
         :collapse-transition="false" router :default-active="activePath" >
          <!-- 一级菜单 ,index为展开关闭提供独属值.动态绑定后返回确切值，id为number，index需要字符串-->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key=item.id >
            <!-- 一级菜单模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-location"></i>
              <!-- 内容 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children"
            :key=subItem.id @click="saveNavState('/'+subItem.path)" >
              <template slot="title" >
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 内容 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
  export default {
    created() {
      this.getMenuList()
      this.activePath=window.sessionStorage.getItem('activePath')
    },
    data() {
      return {
        //菜单数据
        menulist:[],
        // 折叠
        isCollapse:false,
        //菜单路径
        activePath:''
      }
    },
    methods: {
      //退出
      logout() {
        //清空token
        window.sessionStorage.clear()
        //跳转到登录页面
        this.$router.push('/login')
      },
      async getMenuList(){
        const {data:res}=await this.$http.get('menus')
        if(res.meta.status!==200) return this.$message.error('res.meta.msg')
        this.menulist=res.data
        console.log('菜单数据',res);
      },
      //左边菜单折叠与展开
      toggleCollapse(){
        this.isCollapse=!this.isCollapse
      },
      //菜单高亮
      saveNavState(activePath){
        // console.log('这是',activePath);
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath=activePath
      }
    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0px;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
      //专门针对左边的div进行设计
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }

  }

  .el-aside {
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 30px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.5em; //字体内部边距
    cursor: pointer;  //鼠标停留变手指
  }
</style>
